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CVE-2026-55878 high CVSS 7.8

Path Traversal in symfony/ux-toolkit (CVE-2026-55878)

Summary

Path traversal in symfony/ux-toolkit (CVE-2026-55878). Successful exploitation can lead to full system takeover. Exploitable via true. Mitigation: upgrade to 3.2.0 or later.

Original description

The description as published by the source.

Description

The ux:install console command installs files from a recipe kit by copying paths listed in a copy-files map. The only guard against malicious paths was Path::isRelative(), which returns true for paths like ../../../etc. Path::join() then resolves the .. segments without complaint, so the final path can escape the intended directory entirely. A crafted or compromised kit can therefore write attacker-controlled content to arbitrary locations on the developer's machine or CI runner.

Because the copy operation creates missing parent directories and can overwrite existing files silently (with --force or in non-interactive environments), an attacker who controls a kit can overwrite files such as controllers, git hooks, or .env to achieve code execution. The source side of copy-files is symmetrically affected, enabling local file reads outside the recipe directory.

Resolution

The fix introduces an Assert::pathDoesNotEscapeDirectory() helper that rejects any copy-files source or destination path containing a .. segment, regardless of whether / or \ is used as the separator. This check is enforced in both RecipeManifest (which also guards the source Finder) and File. As a last line of defense, the installer re-verifies the fully resolved paths with Path::isBasePath() immediately before each filesystem read and write.

Credits

Symfony would like to thank Pascal Cescon for reporting the issue and Hugo Alliaume for pro…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-55878 has been found in symfony/ux-toolkit.
Attackers can target a specific entry point like true over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: upgrade symfony/ux-toolkit to 3.2.0 or later.
If unsure, ask your IT team or search "symfony/ux-toolkit CVE-2026-55878" on the vendor's site.

CVE-2026-55878 (symfony/ux-toolkit) — CWE-22 / CVSS v3 7.8
Attack vector: local / unauthenticated
Attack surface: true / RecipeManifest / File
Patched: 3.2.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Path traversal (CWE-22) exists in symfony/ux-toolkit. Attackers reach the vulnerable code path via true without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of symfony/ux-toolkit. Attack surface: true / RecipeManifest / File.

🔥 Severity

Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 3.2.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'symfony/ux-toolkit' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'symfony/ux-toolkit' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で symfony/ux-toolkit を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade symfony/ux-toolkit to 3.2.0

    ステージング環境で 3.2.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

composer symfony/ux-toolkit
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.0"}]}]
Packagist symfony/ux-toolkit
[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.2.0"}]}]

References

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